This documentation + <para> + Specify the maximum size of WAL files + that <link linkend="streaming-replication-slots">replication + slots</link> are allowed to retain in the <filename>pg_wal</filename> + directory at checkpoint time. + If <varname>max_slot_wal_keep_size</varname> is zero (the default), + replication slots retain unlimited size of WAL files. + </para>
doesn't say anything about what happens when the limit is exceeded. Does the system halt until the WAL is fetched from the slots? Do the slots get invalidated? Also, I don't think 0 is a good value for the default behavior. 0 would mean that a slot is not allowed to retain any more WAL than already exists anyway. Maybe we don't want to support that directly, but it's a valid configuration. So maybe use -1 for infinity. -- Peter Eisentraut http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
